Plastic cap



FIG. 1 is a front, top and right side perspective view of a plastic cap showing the new design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a right side view thereof; and,

FIG. 5 is a top view thereof. 

The ornamental design for a plastic cap, as shown and described. 